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A kind of transition metal selenium sulfur complex and preparation method thereof

A transition metal and composite technology, applied in the direction of active material electrodes, structural parts, electrical components, etc., can solve the problems that the specific capacity and cycle performance cannot achieve the expected results, the selenium metal particles are easy to agglomerate, and the composite material has irregular morphology. , to achieve excellent cycle and rate performance, improve structural stability and conductivity, and excellent rate performance

Active Publication Date: 2021-01-19
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In summary, the preparation of metal selenium sulfur composites will effectively improve the intrinsic conductivity and theoretical specific capacity of the material, and can design electrode materials with good battery performance. However, in the actual preparation process, due to the easy aggregation of selenium metal particles, the final composite The shape of the material is irregular, and the specific capacity and cycle performance cannot achieve the expected results

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  • A kind of transition metal selenium sulfur complex and preparation method thereof
  • A kind of transition metal selenium sulfur complex and preparation method thereof
  • A kind of transition metal selenium sulfur complex and preparation method thereof

Examples

Experimental program
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Embodiment 1

[0040] Preparation of the transition metal selenium sulfur complex of the present invention comprises the following steps:

[0041] (1) Weigh 1.1508 g of cobalt nitrate and dissolve it in 100 mL of methanol to form a cobalt nitrate solution; weigh 1.6231 g of 2-methylimidazole and dissolve it in 100 mL of methanol to form a 2-methylimidazole solution; Pour the 2-methylimidazole solution into the cobalt nitrate solution, and let it stand at room temperature for 20 hours, centrifuge, wash, and blow dry to obtain the metal organic framework;

[0042] (2) performing heat treatment on the metal organic framework to obtain the precursor, the heat treatment temperature is 600°C, the heat treatment time is 2 hours, and the heat treatment atmosphere is nitrogen atmosphere;

[0043](3) Weigh 0.5 mmol of selenium powder, disperse it in 15 mL of absolute ethanol at 0°C, add 1 mmol of sodium borohydride, and fully react until no bubbles are generated to obtain a selenium source solution; ...

Embodiment 2

[0048] Preparation of the transition metal sulfide of the present invention comprises the following steps:

[0049] (1) Weigh 1.1508 g of cobalt nitrate and dissolve it in 100 mL of methanol, weigh 1.6231 g of 2-methylimidazole and dissolve it in 100 mL of methanol, after fully dissolving, pour the 2-methylimidazole solution into the cobalt nitrate solution , and stood at room temperature for 20 hours, centrifuged, washed, and blast-dried to obtain a metal-organic framework;

[0050] (2) Perform heat treatment on the metal organic framework to obtain the precursor, the heat treatment temperature is 500°C, the heat treatment time is 2h, and the heat treatment atmosphere is argon and hydrogen (hydrogen content 5%) atmosphere;

[0051] (3) Weigh 0.5 mmol of selenium powder, disperse it in 15 mL of absolute ethanol at 0°C, add 1 mmol of sodium borohydride, and fully react until no bubbles are generated to obtain a selenium source solution;

[0052] (4) Dissolve 3.5 mmol of thioac...

Embodiment 3

[0055] Preparation of the transition metal sulfide of the present invention comprises the following steps:

[0056] (1) Weigh 0.4569 g of zinc nitrate and dissolve it in 100 mL of methanol, weigh 8.8274 g of 2-methylimidazole and dissolve it in 100 mL of methanol, after fully dissolving, pour the 2-methylimidazole solution into the cobalt nitrate solution , and stood at room temperature for 20 hours, centrifuged, washed, and blast-dried to obtain a metal-organic framework;

[0057] (2) Perform heat treatment on the metal organic framework to obtain the precursor, the heat treatment temperature is 600°C, the heat treatment time is 1h, and the heat treatment is an argon atmosphere;

[0058] (3) Weigh 0.5 mmol of selenium powder, disperse it in 15 mL of absolute ethanol at 0°C, add 1 mmol of sodium borohydride, and fully react until no bubbles are generated to obtain a selenium source solution;

[0059] (4) Dissolve 3.5 mmol of thioacetamide in 10 mL of ultrapure water as a sulf...

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Abstract

The invention discloses a transition metal selenium-sulfur compound and a preparation method thereof. The chemical composition is (1-w)AnSm / wAxSey / rGO, and A is Zn, Co, Sn or Fe. In the transition metal selenium-sulfur compound, a heterojunction structure is formed between an AnSm phase and an AxSey phase, particles coated with amorphous carbon are formed, and the particles are uniformly dispersedon the surface of reduced graphene oxide. According to the compound, firstly, 2-methylimidazole and salt A react and are subjected to heat treatment to form a precursor, then the precursor is mixed with graphene oxide, finally, a selenium source and a sulfur source are added, a hydrothermal reaction is carried out, and the sodium-ion battery negative electrode prepared from the compound has excellent rate capability and cycle stability.

Description

technical field [0001] The invention belongs to the field of negative electrode materials for sodium-ion batteries, and in particular relates to a transition metal selenium-sulfur compound and a preparation method thereof. Background technique [0002] With the irreversible consumption of fossil energy, the application value of lithium-ion batteries is becoming more and more irreplaceable. However, the low abundance of lithium resources in the earth's crust seriously affects the wide-scale application of lithium-ion batteries. As an element of the same family as lithium, sodium has a high crustal abundance and has a similar energy storage mechanism to lithium, making sodium-ion batteries gradually become a research hotspot in academia and industry. [0003] At present, driven by people's increasing energy demand, high specific energy and high power have become the guideline for the development of secondary batteries. The key lies in the high voltage of the positive electrod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01M4/36H01M4/58H01M4/583H01M10/054
CPCH01M4/366H01M4/581H01M4/583H01M10/054H01M2004/027Y02E60/10
Inventor 张宝王春辉夏海峰欧星张佳峰
Owner CENT SOUTH UNIV
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